How to Get A Variable From A Url By Javascript?

To get a variable from a URL using JavaScript, you can use the window.location.search property to access the query string parameters. You can then parse the query string to extract the desired variable using string manipulation techniques such as split() and slice(). Additionally, you can utilize regular expressions to help extract and match specific patterns within the URL. By accessing the URL parameters dynamically, you can retrieve and use variables in your JavaScript code for various implementations and functionalities on your website.

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How to convert URL-encoded strings to plain text in Javascript?

You can convert URL-encoded strings to plain text in JavaScript using the decodeURIComponent() function. Here is an example:

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const urlEncodedString = "Hello%20World%21";
const plainText = decodeURIComponent(urlEncodedString);

console.log(plainText); // Output: Hello World!

This code snippet takes a URL-encoded string "Hello%20World%21" and converts it to plain text "Hello World!". The decodeURIComponent() function decodes a Uniform Resource Identifier (URI) component previously created by encodeURIComponent or by a similar routine.

How to test URL manipulation functions in Javascript code?

To test URL manipulation functions in JavaScript code, you can use a tool like Jest, Mocha, or Jasmine to write and run automated unit tests. Here is a general outline of how you can test URL manipulation functions in your JavaScript code using Jest:

1. Set up Jest in your project by installing it via npm:

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npm install --save-dev jest

1. Create a test file for your URL manipulation functions (e.g., url.test.js) and import the functions you want to test:

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const { parseUrl, buildUrl } = require('./urlFunctions');

1. Write test cases for each URL manipulation function using Jest's testing functions such as expect:

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test('parseUrl function should return an object with the URL components', () => {
  const url = 'https://example.com/path?param1=value1&param2=value2';
  const parsedUrl = parseUrl(url);

  expect(parsedUrl.protocol).toBe('https:');
  expect(parsedUrl.host).toBe('example.com');
  expect(parsedUrl.pathname).toBe('/path');
  expect(parsedUrl.search).toBe('?param1=value1&param2=value2');
});

test('buildUrl function should return a valid URL string', () => {
  const urlComponents = {
    protocol: 'https:',
    host: 'example.com',
    pathname: '/path',
    search: '?param1=value1&param2=value2'
  };
  const url = buildUrl(urlComponents);

  expect(url).toBe('https://example.com/path?param1=value1&param2=value2');
});

1. Run the Jest test runner in watch mode to continuously run your tests as you make changes to your code:

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npx jest --watch

1. Review the test results and make any necessary adjustments to your URL manipulation functions based on the test outcomes.

By following these steps, you can effectively test your URL manipulation functions in JavaScript code to ensure that they are working as expected and handling different scenarios correctly.

What is the purpose of the URLSearchParams object in Javascript?

The purpose of the URLSearchParams object in JavaScript is to provide a way to interact with the query string parameters of a URL. It allows developers to easily parse, manipulate, and create URL query strings without having to manually handle string manipulation. This can be useful for tasks such as extracting parameters from a URL, adding new parameters, or modifying existing parameters.

What is a URL variable?

A URL variable is a parameter that is included in the URL of a web page or website. It typically consists of a variable name followed by an equals sign and a value, such as "https://example.com/page?variable=value". URL variables are used to pass information from one page to another, or to dynamically generate content based on user input. They are commonly used in web development to create dynamic and interactive websites.

What is the role of the URL hash property in Javascript?

The URL hash property in JavaScript is used to manipulate the portion of a URL that comes after the hash symbol (#). It allows developers to store and update information in the URL without causing the page to reload. This can be useful for creating single-page applications or for navigating through different sections of a webpage without reloading the entire page.

The hash property is commonly used with the window.location object to access and manipulate the URL hash value. Developers can retrieve the current hash value using window.location.hash and update it by setting a new value to window.location.hash.

Overall, the URL hash property in JavaScript provides a way to maintain state in the URL and create a more dynamic and interactive user experience without requiring a full page refresh.